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/*
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <fcntl.h>
#include <sys/reboot.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include "procd.h"
#include "syslog.h"
#include "plug/hotplug.h"
#include "watchdog.h"
#include "service/service.h"
#include "utils/utils.h"
enum {
STATE_NONE = 0,
STATE_EARLY,
STATE_UBUS,
STATE_INIT,
STATE_RUNNING,
STATE_SHUTDOWN,
STATE_HALT,
__STATE_MAX,
};
static int state = STATE_NONE;
static int reboot_event;
static void set_stdio(const char* tty)
{
if (chdir("/dev") ||
!freopen(tty, "r", stdin) ||
!freopen(tty, "w", stdout) ||
!freopen(tty, "w", stderr) ||
chdir("/"))
ERROR("failed to set stdio\n");
else
fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
}
static void set_console(void)
{
const char* tty;
char* split;
char line[ 20 ];
const char* try[] = { "tty0", "console", NULL }; /* Try the most common outputs */
int f, i = 0;
tty = get_cmdline_val("console",line,sizeof(line));
if (tty != NULL) {
split = strchr(tty, ',');
if ( split != NULL )
*split = '\0';
} else {
// Try a default
tty=try[i];
i++;
}
if (chdir("/dev")) {
ERROR("failed to change dir to /dev\n");
return;
}
while (tty!=NULL) {
f = open(tty, O_RDONLY);
if (f >= 0) {
close(f);
break;
}
tty=try[i];
i++;
}
if (chdir("/"))
ERROR("failed to change dir to /\n");
if (tty != NULL)
set_stdio(tty);
}
static void state_enter(void)
{
char ubus_cmd[] = "/sbin/ubusd";
switch (state) {
case STATE_EARLY:
LOG("- early -\n");
watchdog_init(0);
hotplug("/etc/hotplug.json");
procd_coldplug();
break;
case STATE_UBUS:
// try to reopen incase the wdt was not available before coldplug
watchdog_init(0);
set_stdio("console");
LOG("- ubus -\n");
procd_connect_ubus();
service_init();
service_start_early("ubus", ubus_cmd);
break;
case STATE_INIT:
LOG("- init -\n");
procd_inittab();
procd_inittab_run("respawn");
procd_inittab_run("askconsole");
procd_inittab_run("askfirst");
procd_inittab_run("sysinit");
// switch to syslog log channel
ulog_open(ULOG_SYSLOG, LOG_DAEMON, "procd");
break;
case STATE_RUNNING:
LOG("- init complete -\n");
break;
case STATE_SHUTDOWN:
/* Redirect output to the console for the users' benefit */
set_console();
LOG("- shutdown -\n");
procd_inittab_run("shutdown");
sync();
break;
case STATE_HALT:
// To prevent killed processes from interrupting the sleep
signal(SIGCHLD, SIG_IGN);
LOG("- SIGTERM processes -\n");
kill(-1, SIGTERM);
sync();
sleep(1);
LOG("- SIGKILL processes -\n");
kill(-1, SIGKILL);
sync();
sleep(1);
if (reboot_event == RB_POWER_OFF)
LOG("- power down -\n");
else
LOG("- reboot -\n");
/* Allow time for last message to reach serial console, etc */
sleep(1);
/* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS)
* in linux/kernel/sys.c, which can cause the machine to panic when
* the init process exits... */
if (!vfork( )) { /* child */
reboot(reboot_event);
_exit(EXIT_SUCCESS);
}
while (1)
sleep(1);
break;
default:
ERROR("Unhandled state %d\n", state);
return;
};
}
void procd_state_next(void)
{
DEBUG(4, "Change state %d -> %d\n", state, state + 1);
state++;
state_enter();
}
void procd_state_ubus_connect(void)
{
if (state == STATE_UBUS)
procd_state_next();
}
void procd_shutdown(int event)
{
if (state >= STATE_SHUTDOWN)
return;
DEBUG(2, "Shutting down system with event %x\n", event);
reboot_event = event;
state = STATE_SHUTDOWN;
state_enter();
}
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